Performance Monitoring for Web Streams (Response API)

[lforst]

This was originally raised in #9626

We currently don't track the performance of web streams well. What does count as web streams? Basically everything that returns data in chunks (probably even normal http responses too):

• Websockets
• Server Sent Events
• Video streams
• etc.

In node we do this reasonably well because we hook into res.end() which generally marks the end of a Stream, however, we need to improve the WinterCG case with Response. The reader seems to have a done property on stream chunks that we could use to mark the end of the stream.